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Yellowing-resistant solvent type polyurethane leather coating agent and preparation thereof

A polyurethane leather, solvent-based technology, applied in the field of yellowing-resistant solvent-based polyurethane leather finishing agent and its preparation, can solve the problems of poor stability, high cost, complicated production process, etc., and achieves improved stability, simplified production process, reduced cost effect

Inactive Publication Date: 2009-08-12
无锡双象新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used yellow-resistant polyurethane leather finishing agents are usually isophorone diisocyanate and hydrogenated MDI, which have the disadvantages of high cost, poor stability and complex production process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] at 6m 3 Put polyol (wherein 3020 20%, PTMG40%, PCL40%) 1100KG, chain extender (wherein EG60%, BG20%, HD20%) 78KG, solvent (MEK:DMF=2:8) 1850KG and Isocyanate 250KG, control the temperature at 70±2°C, after reacting for 1-1.5 hours, add the remaining 30KG of isocyanate in 2-3 times according to the proportion, control the temperature at 85±2°C, and divide the remaining solvent 2524KG into 2-3 Add once to obtain a slurry with a solid content of 25±1% and a viscosity of 4±0.1 million CPS, then control the kettle temperature below 55°C and add 22KG of composite antioxidant, 44KG of light stabilizer and 22KG of ultraviolet absorber, and stir for 1 to 1.5 Hours to obtain anti-yellowing solvent-based polyurethane leather finishing agent.

Embodiment 2

[0018] at 6m 3 Put polyol (3020 30%, PTMG30%, PCL40%) 1100KG, chain extender (EG50%, BG25%, HD25% BG) 80KG, solvent (MEK:DMF=1:9) 1800KG into the stainless steel reactor and isocyanate 248KG, control the temperature at 70±2°C, after 1-1.5 hours of reaction, add the remaining 28KG of isocyanate in 2-3 times according to the proportion, control the temperature at 85±2°C, and divide the remaining solvent 1597KG into 2-3 times Add 3 times to obtain a slurry with a fixed solid content of 30±1% and a viscosity of 6±0.1 million CPS, then control the temperature of the kettle below 55°C and add 18.7KG of composite antioxidant, 18.7KG of light stabilizer and 27.5 kg of ultraviolet absorber KG, stirring for 1-1.5 hours to obtain an anti-yellowing solvent-type polyurethane leather finishing agent.

Embodiment 3

[0020] at 6m 3 Put polyol (3020 40%, PTMG50%, PCL10%) 1100KG, chain extender (EG40%, BG30%, HD30% BG) 85KG, solvent (MEK:DMF=3:7) 1900KG into the stainless steel reactor and isocyanate 250KG, control the temperature at 70±2°C, react for 1-1.5 hours, add the remaining 28KG of isocyanate in 2-3 times according to the proportion, control the temperature at 85±2°C, and divide the remaining solvent 1514KG into 2-3 times Add 3 times to obtain a slurry with a solid content of 30±1% and a viscosity of 9±0.1 million CPS, then control the temperature of the kettle to add 19.5KG of composite antioxidant, 24KG of light stabilizer and 48KG of ultraviolet absorber under 55°C, and stir for 1 The anti-yellowing solvent-based polyurethane leather finishing agent was obtained in ~1.5 hours.

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PUM

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Abstract

The invention relates to a polyurethane leather finishing agent, in particular to a yellowing resisting solvent type polyurethane leather finishing agent and a preparation method thereof. The common solvent type polyurethane leather finishing agent (TDI system) makes use of an antioxidant, a light stabilizer and an ultraviolet absorbent which are mixed at a low temperature to prepare the yellowing resisting solvent type polyurethane leathering agent. According to the technical proposal provided by the invention, the finishing agent comprises 100 portions of polyol, 6.73 to 8 portions of chain extender, 23.64 to 26.09 portions of isocyanate TDI, 308.8 to 397.6 portions of solvent, 1.46 to 2.46 portions of composite antioxidant, 1.46 to 4.0 portions of light stabilizer and 2.0 to 4.36 portions of ultraviolet absorbent; and the unit is portion by mass. The yellowing resisting level of the common yellowing resisting solvent type polyurethane leather finishing agent reaches over level 3.

Description

technical field [0001] The invention relates to a polyurethane leather finishing agent, in particular to a yellowing-resistant solvent-type polyurethane leather finishing agent and a preparation method thereof. This common solvent-based polyurethane leather finishing agent (TDI system) is prepared by mixing an antioxidant, a light stabilizer and an ultraviolet absorber at low temperature into a yellowing-resistant solvent-type polyurethane leather finishing agent. Background technique [0002] Polyurethane material is a synthetic polymer material with a wide range of uses and excellent performance. After World War II, the research and application of polyurethane materials developed worldwide. The structure of polyurethane materials is mostly composed of soft segments and hard segments in the form of blocks, grafts or interpenetrating networks. The soft segment is usually polyether or polyester polyol, which can endow polyurethane with excellent flexibility and toughness. Th...

Claims

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Application Information

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IPC IPC(8): C09D175/04C14C11/00
Inventor 何天华陈志府董文天
Owner 无锡双象新材料有限公司